Hokkaido University School of Veterinary Medicine and Obihiro University of Agriculture and Veterinary Medicine, Cooperative Veterinary Education Program, Hokkaido University, Obihiro University of Agriculture and Veterinary Medicine
Obihiro University of Agriculture and Veterinary Medicine
Obihiro University of Agriculture and Veterinary Medicine
Obihiro University of Agriculture and Veterinary Medicine
Azabu University
Azabu University
The University Museum, The University of Tokyo
Gunma Museum of Natural History
Kamori Kanko Co., Ltd.
Forestry and Forest Products Research Institute
Nagano Environmental Conservation Research Institute
Kanagawa Prefectural Museum of Natural History
Asahiyama Zoo
Asahiyama Zoo
Asahiyama Zoo
Asahiyama Zoo
Iwate University
Hokkaido University School of Veterinary Medicine and Obihiro University of Agriculture and Veterinary Medicine, Cooperative Veterinary Education Program, Hokkaido University
登録日
2022-01-24
雑誌名
Journal of Veterinary Medical Science
巻
83
号
8
ページ
1284 - 1289
発行年
2021
ISSN
13477439
09167250
抄録
In several primates and carnivores, pronation/supination angles of the forearm skeleton were examined, and it is thought that a larger angle is useful to acquire dexterous behaviors in feeding and/or life style, including climbing. In this study, the pronation/supination angles in Asiatic black, brown and polar bears were nondestructively examined. These specimens were classified as adult or non-adult. Three or four carcasses of each group of Asiatic black and brown bears were used for CT analysis, whereas only one adult polar bear was used. The forearms were positioned within the gantry of a CT scanner in both maximally supinated and pronated states. Extracted cross-sectional CT images of two positions were superimposed by overlapping the outlines of each ulna. The centroids of the radii were detected, and then the centroid of each radius and the midpoint of a line which connects between both ends of the surface of each radius facing the ulna, were connected by lines to measure the angle of rotation as an index of pronation/supination. In adult brown and polar bears, the angles were smaller as compared with the other groups (Asiatic black and non-adult brown bears). Asiatic black and non-adult brown bears can climb trees, whereas adult brown bears and polar bears cannot. This suggests that the pronation/supination angle is related to arboreal activity in Ursidae.
Mobility of the forearm skeleton in the Asiatic black (Ursus thibetanus), brown (U. arctos) and polar (U. maritimus) bears
jvms-v83n8p1284-1289
(1.64MB)
